Door.



k0. W. MEISSNBR. DOOR.4

APPLICATION IILD MAB. 12, 1909.

Patented NOV.`12, 1912 v. IIIII @X3i/themes Loaaesa.

'inn sae rarer onirica.

i OTTO WILLIAM MEISSNER, OF WESTMOUNT, QUEBEC, CANADA.

To oli whom it may concern:

Be it known that I, @Tro lViLLiAM Mniss- NER, of the town of W'estmount, Province of Quebec, Canada, a citizen of the United States, have invented certain new and useful Improvements in Doors; and l. do here-` the latter'being formed -witli.a depending" f transverse flange received in a depression in the first mentioned door part to constitute a trap for preventing leakage, while the main door part is formed with ribs pressed upwardly out of the same. For full comprehension, however of my invention reference must be had to the accompanying drawings forming a part of this specification and wherein corresponding reference numerals indicate the same parts.

Figure l is a part plan and part horizontal sectional view of a doorl constructed according to my invention, the section being taken on line A. A Fig. 2; and Fig. 2 is a transverse vertical sectional view taken on .line B B Fig. l. Fig. 3 is a similar view door is preferably of trough form and di-V vided intotwo parts o and d of which the part 'o is shorter thanthe door openingand the balance of such opening is closed by the partfl Which'extends from side to side of and overlaps and completely envelope the free end of the part o. The door o is hinged as at o to av pair of U-brackets f xed 'to the door frame,'and the door ol is hinged to a pair of similar brackets 'g fixed to a pair of depending. rigid members h carried by the door `frame. A pair of short door railsz' supporta shaft j beneath the .door ol and a4 pair of -cliains lo are connected at one end to the shaft and at their other ends to brackets m upon thesides of and extending below the door o, the chains being fastened Speccatiol of Letters Eatent.

rarement Nov. ie, mie.

'Application sied Marca iafieos. seriai No. 483,020.

to the parts of the brackets beneath the doorn The free end of the door o is formed-with a depending transverse flange o andthe sides and hinged end thereof have a continuous upwardly projecting flange p constituting the trough formation and adapted to inclose the/corresponding portions of the has a pair of prolated oval ribs g. The door d is formed with an angular bottom and vdoor fraine'tlange. The bottom of thisl door side and hinge-end flanges ygthe'interior recess presented by the angular bottom re` ceiving the dependingtange o, the chambervr s'QFig. 2) outside of the fiange acting as a trap for any material leaking'between the flange o and the angular bottom.

C .To open the door the shaft is rotated in the direction indicated which causes it to roll on the underside ofdoor CZ thus permitting such door to fal, and the door o .accompanies it and continues to fall as the chains are unwound, the door cl resting on the shaft as it moves down'the incline unwinding the'cliains, both doors being in full open position when the shaft is stalled at the lower ends of the rails.

When closing the doors the shaft is ro tated in the opposite direction and the chains wound thereon, and as the resistance offered by the incline of the rails and the tendency of the shaftA to roll down such ineline, is greater than that offered by the door o the latter is lifted until the brackets m and the shaft are in alinement7 and then the lshaft climbs the chain. At the ,time

when the shaft begins-to climb the chains frame presenting a door opening, of a door flanged on three sidesto present a trough having one end open, and a member coact` ing with such door in closing the door opening and adapted to overlap and inclose the bottoni and sides of said open end of the trough. r Y

V2. They combination with a downwardly anged door frame, of a two part drop door the parts whereof are hinged on opposite Y the other door part having an angular botall sides thereof, the free edges of the door.

door part with the apex of the angle ensides of the door frame and each hasa continuous flange projecting upwardly from the hinged side and the two adjacent sides thereof the space between the ends 'of the flanges at the remaining side of each door being open, such flanges closely inclosing; the downward flanges of the door frame on parts and the adjacent portions lof the flanges overlapping.

3. The combination with a flanged door frame, of a two part drop door, one door part having a knife-like transverse flange' extending downwardly substantially at right angles tothe door from theiree end thereof,

tom adapted to overlap the first mentioned4 gaged by the lower edge of the said transverse flange, 'for the purpose set forth.

4. The combination with a door frame, of a twopart drop door, one door part having a knife-like transverse flange extending downwardly from the freie end thereof. the other door part presenting a concaved chamber within which the said flange is located when the door is closed with theedge of the upwardly projecting lange'thereon closely y straddling the adjacent ends of the upwardly projecting flange of the first mentioned door part, such second door part lap* the first mentioned door part with the apex of the yangle engaged by the lower edge of thesaid transverse fiange, for the purpose set forth.

'-.having anvangular bottom adapted to over In testimony whereof, I have signed 'my name to this specification, in the presence of two subscribing witnesses.

OTTO WILLIAM MEISSNER. Witnesses:

WILLIAM P. MGFEAT, FRED'J. SEARS.'

Copies of this patent mayl be obtained for ve cents each, by addressing the Commissioner ot Patents; l

washington, D. c. 

